CN117169753B - Method and device for determining parameters of electric connection pieces of batteries connected in series and electronic equipment - Google Patents
Method and device for determining parameters of electric connection pieces of batteries connected in series and electronic equipment Download PDFInfo
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Abstract
The invention discloses a method and a device for determining parameters of an electric connector of a series battery and electronic equipment. Wherein the method comprises the following steps: determining measurement voltages respectively corresponding to a plurality of batteries connected in series; determining extreme voltage from the measured voltages corresponding to the batteries respectively; determining a first average voltage of the plurality of batteries according to the measured voltages respectively corresponding to the plurality of batteries; determining a target difference value according to the extreme voltage, the first average voltage and the adjacent voltage corresponding to the adjacent battery; determining an initial electrical connector parameter between the extremum cell and the adjacent cell if the target differential is greater than a first threshold; and determining the target electric connector parameters according to the corresponding relation between the target difference value and the target according to the initial electric connector parameters, so as to set the electric connector parameters as the target electric connector parameters. The invention solves the technical problem of inaccurate measurement voltage caused by inaccurate parameter setting of the electric connecting piece in the battery in the related technology.
Description
Technical Field
The invention relates to the field of energy storage batteries, in particular to a method and a device for determining parameters of an electric connecting piece of a series battery and electronic equipment.
Background
The battery module is composed of a plurality of battery cells, each battery cell is connected with an electric connecting piece in a welding or bolting mode, the electric connecting piece connects the battery cells in series or in parallel to form a battery module with certain voltage and capacity level, and the battery module is generally provided with a battery management system for collecting and monitoring state information such as voltage, current and temperature of the battery module and estimating the state of charge and the state of life of the battery.
However, with the related method provided in the related art, in setting the parameters of the electrical connection in the battery, the measured voltage is inaccurate due to the inaccuracy of the setting.
In view of the above problems, no effective solution has been proposed at present.
Disclosure of Invention
The embodiment of the invention provides a method and a device for determining parameters of an electric connector of a series battery and electronic equipment, which at least solve the technical problem of inaccurate measurement voltage caused by inaccurate parameter setting of the electric connector in the battery in the related technology.
According to an aspect of the embodiment of the present invention, there is provided a method for determining parameters of an electrical connection member of a series battery, including: determining measurement voltages respectively corresponding to a plurality of batteries connected in series, wherein the batteries have the same rated voltage parameters and the corresponding production time length is smaller than a preset time length; determining extreme voltage from the measured voltages corresponding to the batteries respectively; determining a first average voltage of the plurality of batteries according to the measured voltages respectively corresponding to the plurality of batteries; determining a target difference value according to the extreme voltage, the first average voltage and an adjacent voltage corresponding to an adjacent battery, wherein the adjacent battery is a battery adjacent to the extreme voltage, and the extreme voltage is a battery corresponding to the extreme voltage; determining an initial electrical connector parameter between the extremum cell and the adjacent cell if the target differential is greater than a first threshold; and determining a target electric connector parameter according to the initial electric connector parameter and the target corresponding relation between the target difference value and the target, so as to set the electric connector parameter as the target electric connector parameter, wherein the target corresponding relation is corresponding relation data between voltage and electric connector parameter items, and the electric connector parameter items comprise parameter items corresponding to the initial electric connector parameter.
Optionally, before determining the target electrical connector parameter according to the initial electrical connector parameter, the target difference value and the target correspondence relationship further includes: determining a first corresponding relation between the parameter item of the electric connector and the internal resistance and a second corresponding relation between the internal resistance and the voltage, wherein the internal resistance represents the internal resistance between adjacent sampling points on any two adjacent batteries; and determining the target corresponding relation according to the first corresponding relation and the second corresponding relation.
Optionally, determining the target electrical connector parameter according to the initial electrical connector parameter, the target difference value and the target correspondence, includes: under the condition that the number of parameter items corresponding to the initial electrical connector parameters is multiple, determining a plurality of groups of electrical connector parameter configuration strategies according to the corresponding relation between the target difference value and the target according to the multiple initial electrical connector parameters, wherein the plurality of groups of electrical connector parameter configuration strategies correspond to different electrical connector parameters respectively; determining configuration costs corresponding to the plurality of sets of electrical connector parameter configuration policies; determining the corresponding electrical connector parameter configuration strategy with the lowest configuration cost from the plurality of groups of electrical connector parameter configuration strategies as a target electrical connector configuration strategy; and determining the electrical connection parameters included in the target electrical connector configuration strategy as the target electrical connector parameters.
Optionally, the determining the target difference according to the extreme voltage, the first average voltage, the adjacent voltage corresponding to the adjacent battery, includes: determining a second average voltage of the extreme voltage and the adjacent voltage; and determining a difference value between the second average voltage and the first average voltage as the target difference value.
Optionally, the determining the first average voltage of the plurality of batteries according to the measured voltages respectively corresponding to the plurality of batteries includes: determining voltage difference values of the extreme voltages and measured voltages corresponding to other batteries in the plurality of batteries respectively; and under the condition that the voltage difference values are smaller than a second threshold value, determining the first average voltage according to the measured voltages respectively corresponding to the batteries.
Optionally, the determining the measured voltages respectively corresponding to the plurality of batteries includes: and determining measured voltages respectively corresponding to the plurality of batteries in response to a predetermined operation, wherein the predetermined operation is an operation of setting a parameter of an electrical connection to the initial electrical connection parameter.
Optionally, the parameter items corresponding to the initial electrical connector parameters include at least one of the following: the device comprises an electric connecting piece material, an electric connecting piece plating layer, a pole parameter and a sampling point position parameter.
According to an aspect of the embodiment of the present invention, there is provided an electrical connector parameter determining apparatus for a series battery, including: the first determining module is used for determining measurement voltages respectively corresponding to a plurality of batteries, wherein the batteries are batteries with the same rated voltage parameters and corresponding production time lengths are smaller than a preset time length; the second determining module is used for determining extreme voltage from the measured voltages corresponding to the batteries respectively; a third determining module, configured to determine a first average voltage of the plurality of batteries according to the measured voltages corresponding to the plurality of batteries, respectively; a fourth determining module, configured to determine a target difference according to the extreme voltage, the first average voltage, and an adjacent voltage corresponding to an adjacent battery, where the adjacent battery is a battery adjacent to the extreme voltage, and the extreme voltage is a battery corresponding to the extreme voltage; a fifth determining module for determining an initial electrical connection parameter between the extremum cell and the adjacent cell if the target difference is greater than a first threshold; and a sixth determining module, configured to determine a target electrical connector parameter according to the initial electrical connector parameter and the target correspondence between the target difference and the target, so as to set the electrical connector parameter as the target electrical connector parameter, where the target correspondence is correspondence data between voltage and an electrical connector parameter item, and the electrical connector parameter item includes a parameter item corresponding to the initial electrical connector parameter.
According to an aspect of an embodiment of the present invention, there is provided an electronic apparatus including: a processor; a memory for storing the processor-executable instructions; wherein the processor is configured to execute the instructions to implement the method of determining electrical connector parameters of a series battery as described in any one of the above.
According to an aspect of an embodiment of the present invention, there is provided a computer-readable storage medium, which when executed by a processor of an electronic device, causes the electronic device to perform the method of determining an electrical connector parameter of a series battery as described in any one of the above.
In the embodiment of the invention, the measurement voltages respectively corresponding to the plurality of batteries connected in series are determined, wherein the plurality of batteries have the same rated voltage parameter and the corresponding production time length is smaller than the preset time length. And determining an extreme voltage from the measured voltages respectively corresponding to the batteries, determining a first average voltage of the batteries according to the measured voltages respectively corresponding to the batteries, and determining a target difference value according to the extreme voltage, the first average voltage and the adjacent voltage corresponding to the adjacent battery, wherein the adjacent battery is a battery adjacent to the extreme battery, and the extreme battery is a battery corresponding to the extreme voltage. And under the condition that the target difference value is larger than a first threshold value, determining an initial electric connector parameter between the extreme battery and the adjacent battery, and determining a target electric connector parameter according to the initial electric connector parameter and a target corresponding relation to set the electric connector parameter as the target electric connector parameter, wherein the target corresponding relation is corresponding relation data between voltage and an electric connector parameter item, and the electric connector parameter item comprises a parameter item corresponding to the initial electric connector parameter. Since the internal resistance is expressed as the internal resistance between adjacent sampling points on any two adjacent cells. Therefore, through adjusting adjacent sampling points on any two adjacent batteries, the corresponding measured internal resistance can be changed, namely, through adjusting the internal resistances of the extreme value battery and the adjacent batteries, the second average voltage of the extreme value battery is ensured to meet the requirement of the first average voltage range, so that the effect of improving the voltage consistency of the battery module is achieved, and the technical problem that the measurement voltage is inaccurate due to inaccurate parameter setting of an electric connecting piece in the battery in the related art is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a flow chart of a method of determining parameters of an electrical connection of series connected cells according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a sample point arrangement for a battery pack voltage consistency optimization method provided by an alternative embodiment of the present invention;
FIG. 3 is a detailed flow chart of a battery pack voltage consistency optimization method provided by an alternative embodiment of the present invention;
fig. 4 is a block diagram of a configuration of an electrical connection parameter determining apparatus of a serial battery according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
According to an embodiment of the present invention, there is provided an embodiment of a method for determining parameters of an electrical connection of series connected cells, it being noted that the steps shown in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that although a logical sequence is shown in the flowchart, in some cases the steps shown or described may be performed in a different order than what is shown or described herein.
Fig. 1 is a flowchart of a method for determining parameters of an electrical connection of series-connected batteries according to an embodiment of the present invention, as shown in fig. 1, the method comprising the steps of:
step S102, determining measurement voltages respectively corresponding to a plurality of batteries connected in series, wherein the batteries have the same rated voltage parameters and the corresponding production time length is smaller than the preset time length;
in the step S102 provided in the present application, the plurality of batteries in the step may have the same rated voltage parameter and the total voltage after series connection may be measured by using the voltage measuring instrument. The plurality of batteries may be connected in series, and then voltages respectively corresponding to the plurality of batteries connected in series may be measured by using a voltage measuring instrument. In this step, for example, a plurality of identical battery modules can be detected in batches, and the battery module with a problem is screened out, that is, any one string of battery voltage in the battery modules far exceeds the battery string voltage of the corresponding position or number of the battery module of other battery modules under the same condition, so that the screened out problem battery module can ensure accurate feedback of the voltage data on the current internal resistance distribution condition of the battery, and filtering for the subsequent optimization work.
Step S104, determining extreme voltage from the measured voltages corresponding to the batteries respectively;
in the present application, in the providing step S104, the maximum measurement voltage or the minimum measurement voltage is determined from the measurement voltages corresponding to the plurality of batteries determined in the foregoing, and the maximum measurement voltage or the minimum measurement voltage is used as the extreme voltage in the above step. The determined extreme voltage can help judge the battery needing voltage equalization in the batteries so as to further detect the voltage in a targeted way, realize the consistency of the voltages of the batteries and avoid the overcharge or overdischarge of the batteries.
Step S106, determining a first average voltage of the plurality of batteries according to the measured voltages respectively corresponding to the plurality of batteries;
in the step S106, according to the measured voltages corresponding to the batteries, the measured voltages are summed to obtain a sum, and then the sum is divided by the number of batteries to obtain a first average voltage of the batteries, where the first average voltage represents an average level of the voltages of the batteries.
It should be noted that, through the above steps, the first average voltage of the plurality of batteries may be determined, and this average voltage may be used as a reference value to evaluate the overall voltage level of the battery pack and determine whether it meets the use requirement. It should be noted that the first average voltage calculated here simply sums the voltages and does not take into account the imbalance between the cells.
Step S108, determining a target difference value according to the extreme voltage, the first average voltage and the adjacent voltage corresponding to the adjacent battery, wherein the adjacent battery is a battery adjacent to the extreme battery, and the extreme battery is a battery corresponding to the extreme voltage;
in the providing step S108, the adjacent battery refers to the battery closest to the extremum battery, and may be the battery adjacent to the left side of the extremum battery or the battery adjacent to the right side of the extremum battery, which is not limited herein, and may be set in a customized manner according to a specific scene and application.
It should be noted that, for the above steps, a battery adjacent to the extremum battery may be found according to the determination of the extremum battery, and then the extremum voltage and the adjacent voltage are subtracted to obtain the target difference. If the extreme value battery is the battery with the highest voltage, the target difference value is the result of subtracting the adjacent voltage from the extreme voltage; if the extreme battery is the battery with the lowest voltage, the target difference is the result of subtracting the extreme voltage from the adjacent voltage. The difference value between the extreme voltage and the adjacent voltage, namely the target difference value, can be used for judging the voltage balance condition of the battery pack, if the target difference value is too large, the voltage unbalance among the batteries is indicated, adjustment and balance are needed, and the voltage balance of the battery pack can be better reflected through the target difference value.
Step S110, determining initial electric connector parameters between the extreme battery and the adjacent battery under the condition that the target difference value is larger than a first threshold value;
in the providing step S110, the initial electrical connector parameters may include internal resistance, that is, according to the previous steps, the determined target difference value is compared with the first threshold value, if the target difference value is greater than the first threshold value, it indicates that the voltage imbalance condition of the battery pack is serious, and adjustment is required, that is, if the target difference value is greater than the first threshold value, the voltage balance may be achieved by adjusting the parameters of the electrical connector. The parameter adjustment method for the electrical connector in this step may include the following methods:
1) If the extreme voltage is high: the voltage of the extreme battery can be reduced by increasing the resistance or reducing the capacitance, etc., so that the voltage balance is realized.
2) If the extreme voltage is low: the voltage of the extreme battery can be increased by reducing the resistance or increasing the capacitance, etc., so that voltage equalization is realized.
It should be noted that, the process of determining the adjustment parameters according to the specific characteristics of the battery pack and the electrical connector may determine the optimal electrical connector parameters through experiments to achieve voltage equalization. Meanwhile, according to the performance and reliability of the electric connector, the adjusted battery pack can work normally and has good voltage balance.
Step S112, determining a target electric connector parameter according to the initial electric connector parameter, wherein the target electric connector parameter is set as the target electric connector parameter according to the target difference and the target corresponding relation, the target corresponding relation is corresponding relation data between voltage and electric connector parameter items, and the electric connector parameter items comprise parameter items corresponding to the initial electric connector parameter.
In the providing step S112, the target correspondence needs to be determined by establishing correspondence data between the voltage and the electrical connector parameter item, where the target correspondence may reflect a relationship between the voltage and the electrical connector parameter item, and the electrical connector parameter item includes a parameter item corresponding to the initial electrical connector parameter.
It should be noted that, for the above steps, the corresponding target electrical connection parameter may be obtained according to the initial electrical connection parameter, the target difference value and the target correspondence, where the target correspondence may be a set of data points, and the numerical value of the target electrical connection parameter may be obtained by calculating between the data points according to the target difference value by a certain mathematical method. Through the steps, the parameters of the target electric connector can be determined, the parameters of the electric connector are set as the parameters of the target electric connector, so that voltage balance is realized, and further, according to the corresponding relation of the target, the relation between the voltage and the electric connector parameter items can be accurately described, so that the adjusted parameters of the electric connector can be ensured to effectively realize the voltage balance.
Through the steps S102-S112, the measured voltages respectively corresponding to the plurality of batteries connected in series are determined, wherein the plurality of batteries have the same rated voltage parameter and the corresponding production time is smaller than the predetermined time. And determining an extreme voltage from the measured voltages respectively corresponding to the batteries, determining a first average voltage of the batteries according to the measured voltages respectively corresponding to the batteries, and determining a target difference value according to the extreme voltage, the first average voltage and the adjacent voltage corresponding to the adjacent battery, wherein the adjacent battery is a battery adjacent to the extreme battery, and the extreme battery is a battery corresponding to the extreme voltage. And under the condition that the target difference value is larger than a first threshold value, determining an initial electric connector parameter between the extreme battery and the adjacent battery, and determining a target electric connector parameter according to the initial electric connector parameter and a target corresponding relation to set the electric connector parameter as the target electric connector parameter, wherein the target corresponding relation is corresponding relation data between voltage and an electric connector parameter item, and the electric connector parameter item comprises a parameter item corresponding to the initial electric connector parameter. Since the internal resistance is expressed as the internal resistance between adjacent sampling points on any two adjacent cells. Therefore, through adjusting adjacent sampling points on any two adjacent batteries, the corresponding measured internal resistance can be changed, namely, through adjusting the internal resistances of the extreme value battery and the adjacent batteries, the second average voltage of the extreme value battery is ensured to meet the requirement of the first average voltage range, so that the effect of improving the voltage consistency of the battery module is achieved, and the technical problem that the measurement voltage is inaccurate due to inaccurate parameter setting of an electric connecting piece in the battery in the related art is solved.
As an alternative embodiment, before determining the target electrical connector parameter according to the initial electrical connector parameter, the target difference value and the target correspondence relationship further includes: determining a first corresponding relation between the parameter items of the electric connector and the internal resistance and a second corresponding relation between the internal resistance and the voltage, wherein the internal resistance represents the internal resistance between adjacent sampling points on any two adjacent batteries; and determining a target corresponding relation according to the first corresponding relation and the second corresponding relation.
In this embodiment, the first correspondence between the parameter item of the electrical connector and the internal resistance may be calculated by an experiment or the like, the internal resistance may represent the internal resistance between adjacent sampling points on any two adjacent batteries, the first correspondence may reflect the relationship between the internal resistance and the voltage, and the second correspondence may be calculated by an experiment or the like.
For the above steps, a target correspondence may be determined according to the first correspondence and the second correspondence, the target correspondence describing a relationship between the voltage and the electrical connector parameter item. In this step, the first correspondence and the second correspondence may be a set of data points, and may be calculated by a certain mathematical method, and further, mathematical calculation may be performed between the data points according to the internal resistance, so as to obtain a numerical value of the electrical connection parameter item, that is, the target correspondence may be determined.
It should be noted that, through the determined target corresponding relation, on one hand, the method can help to determine the target difference value, and provide basis for the subsequent determination of the electric connector parameters, and on the other hand, the target corresponding relation establishes the relation between the electric connector parameters and the voltage, and by substituting the initial electric connector parameters or a plurality of initial electric connector parameters, the numerical value of the target electric connector parameters can be determined, and to a certain extent, the voltage balance can be realized by adjusting the electric connector parameters, thereby meeting the design requirements and performance indexes.
As an alternative embodiment, determining the target electrical connector parameter according to the initial electrical connector parameter, the target difference value and the target correspondence, includes: under the condition that the number of parameter items corresponding to the initial electrical connector parameters is multiple, determining a plurality of groups of electrical connector parameter configuration strategies according to the corresponding relation between the target difference value and the target of the initial electrical connector parameters, wherein the plurality of groups of electrical connector parameter configuration strategies correspond to different electrical connector parameters respectively; determining configuration costs corresponding to the plurality of sets of electrical connector parameter configuration policies; determining the corresponding electrical connector parameter configuration strategy with the lowest configuration cost from a plurality of groups of electrical connector parameter configuration strategies as a target electrical connector configuration strategy; and determining the electrical connection parameters included in the target electrical connector configuration strategy as target electrical connector parameters.
In this embodiment, for the above steps, multiple sets of electrical connector parameter configuration policies may be obtained according to the multiple parameter items corresponding to the initial electrical connector parameters and the corresponding relation between the target difference and the target, where each set of electrical connector parameter configuration policies corresponds to a different electrical connector parameter, and the values of the target electrical connector parameters may be obtained by substituting the initial electrical connector parameters into the corresponding relation of the target, and then multiple sets of electrical connector parameter configuration policies may be determined according to the design requirements and the performance indexes. For each set of electrical connector parameter configuration strategies, the configuration cost corresponding to the electrical connector parameter configuration strategies needs to be determined, the configuration cost can comprise the price, the installation cost, the maintenance cost and the like of the electrical connector, the different configuration costs can be quantified and evaluated according to actual conditions, further, from multiple sets of electrical connector parameter configuration strategies, the electrical connector parameter configuration strategy with the lowest corresponding configuration cost is determined as the target electrical connector configuration strategy, and the electrical connector parameter configuration strategy with the lowest configuration cost can be selected by comparing the configuration costs of the sets. Finally, in the target electrical connector configuration strategy, the included electrical connection parameters are target electrical connector parameters, and the numerical value of the target electrical connector parameters can be determined according to the target electrical connector configuration strategy.
It should be noted that, through the configuration strategy of the multiple groups of determined electric connection parameters, on one hand, the configuration strategy which is most suitable for actual demands can be selected, and the effect of voltage equalization is improved, on the other hand, the configuration strategy can be adjusted and optimized according to actual conditions, so that the stability and reliability of the battery pack are improved.
As an alternative embodiment, determining the target difference value according to the extreme voltage, the first average voltage, and the adjacent voltage corresponding to the adjacent battery includes: determining a second average voltage of the extreme voltage and the adjacent voltage; and determining the difference value between the second average voltage and the first average voltage as a target difference value.
In this embodiment, in the process of determining the target difference, the second average voltage between the extreme voltage and the adjacent voltage may be determined according to the extreme voltage corresponding to the extreme battery determined by the measurement value of the battery in the battery pack and the adjacent voltage corresponding to the adjacent battery adjacent to the extreme battery, and finally the target difference may be obtained according to the difference between the second average voltage and the first average voltage determined in the foregoing steps.
It should be noted that the second average voltage is obtained by calculating the extreme voltage and the adjacent voltage corresponding to the adjacent battery, which provides a more accurate voltage measurement value, and by comparing the second average voltage with the first average voltage, the state and performance of the battery pack can be more accurately estimated.
As an alternative embodiment, determining the first average voltage of the plurality of batteries according to the measured voltages respectively corresponding to the plurality of batteries includes: determining voltage difference values of the extreme voltages and measured voltages corresponding to other batteries in the plurality of batteries respectively; and under the condition that the voltage difference values are smaller than the second threshold value, determining a first average voltage according to the measured voltages respectively corresponding to the batteries.
In this embodiment, the above voltage difference may be determined by, assuming that, for each battery, the voltage measurement values of the other batteries corresponding to the voltage measurement values are found, and are respectively denoted as V1, V2, V3..
It should be noted that, for the above steps, it may be determined whether each voltage difference is smaller than the second threshold, and if any voltage difference is greater than or equal to the second threshold, the condition is not satisfied, that is, the first average voltage cannot be determined; if all the voltage differences are smaller than the second threshold value, the first average voltage can be calculated, and the measured voltages of the plurality of batteries can be added and divided by the number of batteries to obtain the corresponding first average voltage. The step of determining the first average voltage by comparing the plurality of voltage differences with the second threshold value may determine whether there is a voltage imbalance in the battery pack to a certain extent, and if the voltage difference exceeds the set second threshold value, it may indicate that the voltage deviation of some batteries is large, and an equalization operation is required to ensure the stability and performance of the battery pack.
As an alternative embodiment, determining the measured voltages respectively corresponding to the plurality of batteries includes: the measured voltages respectively corresponding to the plurality of batteries are determined in response to a predetermined operation, wherein the predetermined operation is an operation of setting a parameter of the electrical connector to an initial electrical connector parameter.
In this embodiment, the measured voltages of the plurality of batteries are determined by a predetermined operation, which is an operation of setting the parameter of the electrical connector to the initial electrical connector parameter, the measured voltages of the plurality of batteries may be determined as follows: the parameter of the electrical connector is first set to an initial value, which may include internal resistance, etc., and then a predetermined operation is performed, that is, an operation in which the parameter of the electrical connector may be set to the initial electrical connector parameter, and the measured voltages corresponding to the plurality of batteries, respectively, are determined.
It should be noted that, through the above-mentioned predetermined operation, not only a consistent reference point may be provided for the measured voltage, but also an abnormal situation in the battery pack may be assisted in detection, so as to more accurately compare and analyze the measurement results.
As an alternative embodiment, the parameter items corresponding to the initial electrical connector parameters include at least one of: the device comprises an electric connecting piece material, an electric connecting piece plating layer, a pole parameter and a sampling point position parameter.
In this embodiment, the electrical connector materials described above may have an impact on the performance and measurement results of the battery. Different materials have different electrical conductivity, corrosion resistance and mechanical strength, so that materials suitable for a particular application can be selected, and good electrical conductivity and corrosion resistance can be ensured.
The electrical connector plating may provide additional protection and enhanced electrical conductivity. For example, the plating may prevent corrosion, improve current conduction, and reduce contact internal resistance. Therefore, the plating layer can improve the conductivity, reduce the contact resistance, and reduce the energy loss.
The above-mentioned pole parameters may include the size, shape and material of the pole, which may affect the flow of current and the performance of the battery. For example, larger pole dimensions may provide greater current capacity, while different materials may have different electrochemical properties, which may affect the capacity, cycle life, and charge-discharge performance of the battery.
The sampling point location parameter may refer to a location on the electrical connection where the measured voltage is selected. Different sampling point locations may affect the measurement results because the voltage may vary across the electrical connection. Therefore, selecting an appropriate sampling point location is critical to accurately measuring battery voltage.
It should be noted that, for the above steps, the following ways of reducing the internal resistance between the two sampling points are:
1) Changing the material of the electric connector to a material with higher conductivity, such as changing aluminum to copper;
2) Coating a coating with better conductivity on the material surface, such as galvanization;
3) An adhesive is added between the electric connecting piece and the pole, so that the contact area of the electric connecting piece and the pole is increased, and the internal resistance is reduced;
4) Increasing the thickness of the material of the electric connector;
5) And shortening the current path between two sampling points, such as moving the sampling points towards the battery core pole.
It should be further noted that the above parameter terms are some important factors for determining the initial electrical connector parameters, and according to specific applications and application requirements, appropriate electrical connector materials, plating layers, pole parameters and sampling point position parameters may be selected, so as to improve internal resistance between sampling points of the battery pack and ensure accurate measurement of voltages of multiple batteries.
Based on the foregoing embodiments and optional embodiments, an optional implementation is provided, and is specifically described below.
In the related art, the parameter setting of the electrical connection in the battery is inaccurate, resulting in the technical problem of inaccurate measured voltage.
Description is made of related background art of voltage difference between battery modules: the most important information for evaluating the SOC and the SOH of the battery module is the voltage of each battery cell in the battery module, and the BMS can judge whether the battery system is consistent or not according to the difference between the voltages of the battery cells, but even if each battery cell is normal, the SOC of the battery module is still different to a certain extent after the battery module is assembled, and the difference is also in a regular corrugated form, because the voltage between the electrical connectors at the positive and negative ends of the battery cell is collected by the BMS, the internal resistance of the battery cell is very low and is usually m omega level due to the internal resistance of the battery cell and the external circuit, and therefore, the voltage drop is formed when the current flows through the electrical connectors, so that the difference of the voltages of the battery cells collected by the BMS is caused, and even if the battery cells in the same original state are normal, the difference of the battery cells is caused to occur greatly (such as the special-shaped module, the two ends of the battery module, the electrical connectors and other electrical connectors or the fixed connection place are often present), and the voltage difference of the battery cells in the original state is seriously increased along with the welding of the battery cells, and the battery cells in the end state is greatly increased, and the battery cell discharging power is reduced, and the battery cell discharging power is greatly reduced.
In view of this, an electrical connector parameter determining method for serial batteries is provided in an alternative embodiment of the present invention, fig. 2 is a schematic diagram of sample point arrangement of a battery pack voltage consistency optimizing method provided in an alternative embodiment of the present invention, and fig. 3 is a detailed flowchart of a battery pack voltage consistency optimizing method provided in an alternative embodiment of the present invention, and an alternative embodiment of the present application is described in detail below.
The detailed flow chart of the battery group voltage consistency optimization method is described as follows:
1) And acquiring voltage data of each battery of the battery module, v1-vn.
2) Voltage difference=vmax and Vmin are calculated, and if the voltage difference exceeds a target threshold, the target threshold is set manually according to project performance requirement indexes, vmax represents maximum voltage, and Vmin represents minimum voltage.
3) The average voltage between Vmax or Vmin and the adjacent cell, vmax_ave or vmin_ave, is calculated, and the average voltage Vave of all cells is calculated.
4) If the value of the target threshold is |Vmax_ave or Vmin_ave-Vave| >, the electrical connector resistance of the Vmax or Vmin and the adjacent battery is optimized, the value of the target threshold is ensured to be |Vmax_ave or Vmin_ave-Vave| or less, and the Vmax_ave or the Vmin_ave can possibly approach Vave.
5) And (3) adjusting the position of the sampling point to enable the Vmax or Vmin and the internal resistance of the adjacent battery to be towards the average value.
(II) description is made on a method for determining parameters of electric connectors of batteries in series:
s1, determining measurement voltages respectively corresponding to a plurality of batteries connected in series, wherein the batteries have the same rated voltage parameters and the corresponding production time length is smaller than the preset time length;
it should be noted that the above measurement voltage may be determined by, for example: the battery management system collects the potential difference of the two ends of each string of batteries through the sampling line, so that the voltage of each string of batteries is calculated.
S2, determining extreme voltage from the measured voltages respectively corresponding to the batteries, wherein the extreme voltage comprises a maximum voltage and a minimum voltage;
it should be noted that, the maximum value battery may indicate that the internal resistance of the current string is low, and the minimum value battery may indicate that the internal resistance of the current string is high, if the voltage of a certain string in the battery module is too high, the string first reaches the charge cut-off voltage, so that the whole battery module stops charging or the string is overcharged; similarly, if the voltage of a certain string of batteries in the battery module is too low, the string of batteries reaches the discharge cut-off voltage first, so that the whole battery module stops discharging.
S3, determining voltage difference values of measured voltages corresponding to the batteries respectively, and determining first average voltages of the batteries according to the voltage difference values and a second threshold value;
it should be noted that, in the step of determining the first average voltage, first, voltage differences between the extreme voltages and the measured voltages corresponding to the other batteries in the plurality of batteries are determined, and then, under the condition that the voltage differences are smaller than the second threshold, the first average voltage is determined according to the measured voltages corresponding to the plurality of batteries.
S4, determining a target difference value according to the extreme voltage, the first average voltage, the second average voltage and the adjacent voltage corresponding to the adjacent battery;
the second average voltage is determined by the extreme voltage and the adjacent voltage, that is, an average value of the maximum battery voltage and the adjacent battery voltage may be calculated, or an average value of the minimum battery voltage and the adjacent battery voltage may be calculated. The target difference is determined based on a difference between the second average voltage and the first average voltage. In this step, the average voltage of the extreme value battery and the internal resistance of the electric connection piece corresponding to the adjacent battery can be optimized to be close to the average voltage of all the batteries.
S5, determining a target electric connector parameter according to the initial electric connector parameter, wherein the target electric connector parameter is set as the target electric connector parameter according to the target difference value and the target corresponding relation, the target corresponding relation is corresponding relation data between voltage and electric connector parameter items, and the electric connector parameter items comprise parameter items corresponding to the initial electric connector parameter.
Before determining the parameter of the target electrical connector, determining a first corresponding relation between the parameter item of the electrical connector and the internal resistance and a second corresponding relation between the internal resistance and the voltage, wherein the internal resistance represents the internal resistance between adjacent sampling points on any two adjacent batteries, and then determining the target corresponding relation according to the first corresponding relation and the second corresponding relation. In the step, each string of batteries is provided with two sampling points, the sampling points acquire potential information, and the internal resistance condition between the two sampling points influences voltage drop, so that the voltage value of the string of batteries is influenced; meanwhile, the two sampling points are also components for calculating voltages of two adjacent battery strings, so that the voltage of the two adjacent battery strings is influenced by the variation of the sampling points, the internal resistances of the highest or lowest string and the adjacent string are correlated, and the average voltage is led to be ahead of the average voltage of the battery module directly by optimizing the internal resistances of the correlated electric connectors.
Through the steps, two sampling points corresponding to the extreme battery can be adjusted again, so that the voltage of the extreme battery and the voltage of the adjacent strings of single cells tend to the average voltage. The voltage of the battery can be adjusted by moving the positions of the sampling points, if the voltage corresponding to the maximum battery is the voltage corresponding to the maximum battery, the internal resistance between the two sampling points corresponding to the maximum battery is indicated to be low, namely the current path is short, and the internal resistance of the battery can be increased by shifting the sampling points on two sides of the current path to the poles of the two adjacent batteries, so that the purposes of reducing the voltage of the battery and increasing the voltage of the adjacent batteries are achieved. And the battery module consistency is improved finally by optimizing the polar batteries in multiple rounds.
By the alternative embodiments, at least the following advantages can be achieved:
(1) The extreme voltage is determined from the measured voltages corresponding to the batteries respectively, namely, the determined extreme voltage can help to judge the battery needing voltage equalization in the batteries so as to further detect the voltage in a targeted way, realize the consistency of the voltages of the batteries and avoid the overcharge or overdischarge of the batteries;
(2) Since the second average voltage is derived by calculating the extreme voltage and the adjacent voltage corresponding to the adjacent battery, that is, by comparing the second average voltage with the first average voltage, the state and performance of the battery pack can be more accurately evaluated;
(3) Because the target electric connector parameters are determined according to the initial electric connector parameters, the target difference value and the target corresponding relation are determined, namely, the relation between the voltage and the electric connection parameter items can be accurately described through the target electric connector parameters, so that the adjusted electric connector parameters can be ensured to effectively realize voltage balance;
(4) The internal resistance can represent the internal resistance between adjacent sampling points on any two adjacent batteries, and the corresponding internal resistance is changed by adjusting the adjacent sampling points on any two adjacent batteries, namely, the second average voltage meets the requirement of the first average voltage range by reducing the internal resistances of the extreme value battery and the adjacent batteries, and then the voltage of the extreme value battery and the adjacent batteries is evenly distributed by adjusting the positions of the sampling points, so that the effect of improving the voltage consistency of the battery module is achieved.
It should be noted that, for simplicity of description, the foregoing method embodiments are all described as a series of acts, but it should be understood by those skilled in the art that the present invention is not limited by the order of acts described, as some steps may be performed in other orders or concurrently in accordance with the present invention. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required for the present invention.
From the description of the above embodiments, it will be clear to a person skilled in the art that the method according to the above embodiments may be implemented by means of software plus the necessary general hardware platform, but of course also by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising several instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method of the various embodiments of the present invention.
Example 2
According to an embodiment of the present invention, there is also provided an apparatus for implementing the above method for determining parameters of electrical connectors of batteries in series, and fig. 4 is a block diagram of an apparatus for determining parameters of electrical connectors of batteries in series according to an embodiment of the present invention, as shown in fig. 4, the apparatus including: the first determination module 402, the second determination module 404, the third determination module 406, the fourth determination module 408, the fifth determination module 410, and the sixth determination module 412 are described in detail below.
A first determining module 402, configured to determine measured voltages corresponding to a plurality of batteries, where the plurality of batteries have the same rated voltage parameter and the corresponding production time periods are all less than a predetermined time period; a second determining module 404, coupled to the first determining module 402, for determining an extreme voltage from the measured voltages corresponding to the batteries, respectively; a third determining module 406, coupled to the second determining module 404, for determining a first average voltage of the plurality of batteries according to the measured voltages corresponding to the plurality of batteries, respectively; a fourth determining module 408, coupled to the third determining module 406, for determining a target difference according to the extreme voltage, the first average voltage, and the adjacent voltage corresponding to the adjacent battery, wherein the adjacent battery is a battery adjacent to the extreme battery, and the extreme battery is a battery corresponding to the extreme voltage; a fifth determining module 410, coupled to the fourth determining module 408, for determining an initial electrical connector parameter between the extremum cell and the adjacent cell if the target difference is greater than the first threshold; the sixth determining module 412 is connected to the fifth determining module 410, and is configured to determine a target electrical connector parameter according to the initial electrical connector parameter, the target difference value, and the target correspondence, so as to set the electrical connector parameter as the target electrical connector parameter, where the target correspondence is corresponding relationship data between the voltage and the electrical connector parameter item, and the electrical connector parameter item includes a parameter item corresponding to the initial electrical connector parameter.
Here, the first determining module 402, the second determining module 404, the third determining module 406, the fourth determining module 408, the fifth determining module 410 and the sixth determining module 412 correspond to steps S102 to S112 in the method for determining parameters of electrical connectors of serial batteries, and the plurality of modules are the same as examples and application scenarios implemented by the corresponding steps, but are not limited to those disclosed in the above embodiment 1.
Example 3
According to another aspect of the embodiment of the present invention, there is also provided an electronic device including: a processor; a memory for storing processor-executable instructions, wherein the processor is configured to execute the instructions to implement the method of determining an electrical connector parameter for a series of batteries of any of the above.
Example 4
According to another aspect of the embodiments of the present invention, there is also provided a computer-readable storage medium, which when executed by a processor of an electronic device, causes the electronic device to perform the method of determining the parameters of the electrical connection of the series battery of any one of the above.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
In the foregoing embodiments of the present invention, the descriptions of the respective embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to the related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed technology content may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (8)
1. A method for determining parameters of an electrical connection of batteries in series, comprising:
determining measurement voltages respectively corresponding to a plurality of batteries connected in series, wherein the batteries have the same rated voltage parameters and the corresponding production time length is smaller than a preset time length;
determining extreme voltage from the measured voltages corresponding to the batteries respectively;
determining a first average voltage of the plurality of batteries according to the measured voltages respectively corresponding to the plurality of batteries;
determining a target difference value according to the extreme voltage, the first average voltage and an adjacent voltage corresponding to an adjacent battery, wherein the adjacent battery is a battery adjacent to the extreme voltage, and the extreme voltage is a battery corresponding to the extreme voltage;
determining an initial electrical connector parameter between the extremum cell and the adjacent cell if the target differential is greater than a first threshold;
Determining a target electric connector parameter according to the initial electric connector parameter and the target corresponding relation between the target difference value and the target, so as to set the electric connector parameter as the target electric connector parameter, wherein the target corresponding relation is corresponding relation data between voltage and electric connector parameter items, and the electric connector parameter items comprise parameter items corresponding to the initial electric connector parameter;
wherein, according to the initial electrical connector parameter, the target difference value and the target corresponding relation determine the target electrical connector parameter, including: under the condition that the number of parameter items corresponding to the initial electrical connector parameters is multiple, determining a plurality of groups of electrical connector parameter configuration strategies according to the corresponding relation between the target difference value and the target of the initial electrical connector parameters, wherein the plurality of groups of electrical connector parameter configuration strategies correspond to different electrical connector parameters respectively; determining configuration costs corresponding to the plurality of sets of electrical connector parameter configuration policies; determining the corresponding electrical connector parameter configuration strategy with the lowest configuration cost from the plurality of groups of electrical connector parameter configuration strategies as a target electrical connector configuration strategy; determining the electrical connection parameters included in the target electrical connector configuration strategy as the target electrical connector parameters;
Wherein determining the target difference value according to the extreme voltage, the first average voltage, the adjacent voltage corresponding to the adjacent battery, includes: determining a second average voltage of the extreme voltage and the adjacent voltage; and determining a difference value between the second average voltage and the first average voltage as the target difference value.
2. The method of claim 1, wherein determining the target electrical connector parameter based on the initial electrical connector parameter and the target differential value corresponding to the target further comprises:
determining a first corresponding relation between the parameter item of the electric connecting piece and the internal resistance and a second corresponding relation between the internal resistance and the voltage, wherein the internal resistance represents the internal resistance between adjacent sampling points on any two adjacent batteries;
and determining the target corresponding relation according to the first corresponding relation and the second corresponding relation.
3. The method of claim 1, wherein determining a first average voltage of the plurality of cells based on the measured voltages of the plurality of cells, respectively, comprises:
determining voltage difference values of the extreme voltages and measured voltages corresponding to other batteries in the plurality of batteries respectively;
And under the condition that the voltage difference values are smaller than a second threshold value, determining the first average voltage according to the measured voltages respectively corresponding to the batteries.
4. The method of claim 1, wherein determining the measured voltages corresponding to the plurality of cells, respectively, comprises:
and determining measured voltages respectively corresponding to the plurality of batteries in response to a predetermined operation, wherein the predetermined operation is an operation of setting a parameter of the electrical connector to the initial electrical connector parameter.
5. The method according to any one of claims 1 to 4, wherein the parameter items corresponding to the initial electrical connector parameters include at least one of: the device comprises an electric connecting piece material, an electric connecting piece plating layer, a pole parameter and a sampling point position parameter.
6. An electrical connector parameter determination apparatus for series-connected batteries, comprising:
the first determining module is used for determining measurement voltages respectively corresponding to a plurality of batteries, wherein the batteries are batteries with the same rated voltage parameters and corresponding production time lengths are smaller than a preset time length;
the second determining module is used for determining extreme voltage from the measured voltages corresponding to the batteries respectively;
A third determining module, configured to determine a first average voltage of the plurality of batteries according to the measured voltages corresponding to the plurality of batteries, respectively;
a fourth determining module, configured to determine a target difference according to the extreme voltage, the first average voltage, and an adjacent voltage corresponding to an adjacent battery, where the adjacent battery is a battery adjacent to the extreme voltage, and the extreme voltage is a battery corresponding to the extreme voltage;
a fifth determining module for determining an initial electrical connection parameter between the extremum cell and the adjacent cell if the target difference is greater than a first threshold;
a sixth determining module, configured to determine a target electrical connector parameter according to the initial electrical connector parameter and the target correspondence between the target difference and the target, so as to set the electrical connector parameter as the target electrical connector parameter, where the target correspondence is correspondence data between voltage and an electrical connector parameter item, and the electrical connector parameter item includes a parameter item corresponding to the initial electrical connector parameter;
the fourth determining module is further configured to determine, according to the plurality of initial electrical connector parameters and the target correspondence, a plurality of sets of electrical connector parameter configuration policies according to the target difference and the target correspondence, where the plurality of sets of electrical connector parameter configuration policies correspond to different electrical connector parameters respectively; determining configuration costs corresponding to the plurality of sets of electrical connector parameter configuration policies; determining the corresponding electrical connector parameter configuration strategy with the lowest configuration cost from the plurality of groups of electrical connector parameter configuration strategies as a target electrical connector configuration strategy; determining the electrical connection parameters included in the target electrical connector configuration strategy as the target electrical connector parameters;
Wherein the sixth determining module is further configured to determine a second average voltage of the extreme voltage and the neighboring voltage; and determining a difference value between the second average voltage and the first average voltage as the target difference value.
7. An electronic device, comprising:
a processor;
a memory for storing the processor-executable instructions;
wherein the processor is configured to execute the instructions to implement the method of determining electrical connector parameters of the series connected battery of any one of claims 1 to 5.
8. A computer readable storage medium, characterized in that instructions in the computer readable storage medium, when executed by a processor of an electronic device, enable the electronic device to perform the method of determining the electrical connector parameters of a series battery as claimed in any one of claims 1 to 5.
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